MON'ITOR, noun [Latin] One who warns of faults or informs of duty; one who gives advice and instruction by way of reproof or caution. You need not be a monitor to the king. 1. In schools, a person authorized to look to the scholars in the absence of the instructor, or to notice the absence of faults of the scholars; or to instruct a division of class.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI